為瞭解一冷卻渠道進行往復運動下，混合對流對ㄇ型渠道頂部的熱傳效率影
響，實際架設一組實驗設備來進來實驗，對ㄇ型渠道於靜止與往復運動狀態下，
探討不同雷諾數、不同溫差及搭配不同無因次振動頻率下的組合，並以數值模擬 比對，提高實驗結果的可信度。最後將結果歸納成以下結論:
1. ㄇ型渠道處於靜止狀態下時，由於受渠道幾何形狀及自然對流的影響，所以 前段加熱區熱傳效率最佳、中段加熱區次之、後段加熱區最差。
2. 當渠道進行振動時，壁面熱傳效率較靜止狀態時改善許多，在本實驗中最大 熱傳增益約為 51.3%。
3. 渠道在往復運動狀態下時，提升雷諾數不一定能有效提升其熱傳效應。
4. 本實驗以混合對流去探討熱傳效率的情形，與文獻陳[25]中以強制對流為主 的實驗比較，本實驗熱傳效率較佳，說明在冷卻渠道內自然對流對於熱傳效 率有一定的助益。
5. 在比較文獻中林[29]進口流體與重力同向的 U 型管道,本實驗由於進口流體 與重力反向且加熱區在上方,受自然對流效應影響較大,其熱傳效率低於 U 行 管道。
參考文獻
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附錄一：實驗不準度分析
為提供有效的測試結果，並說明當次測試結果的信賴度，所以實驗不 準度的計算和分析是必要的，一般不準度的表示方式有絕對不準度與相對 不準度兩種，本文採用 Kline[27]之相對不準度來分析第四章實驗結果，
根據 Kline 之研究
1.1 熱傳量Qair之不準度:
(ii) 巴沙木尺寸 62.00mm*12.00mm，游標尺最小刻度 0.05mm
(iii) 溫差最大範圍 45.775－44.875=0.9℃，DA2500E 之準確度為
0.1℃
因此其不準度為
F. 加熱片 2 與加熱片 5 間熱傳量之不準度
加熱片面積 62.00mm×12.00mm，游標尺最小刻度 0.05mm
2
加熱片與室溫溫度差最大範圍 35.1－25.8=10.3℃，DA2500E 之準 確度為 0.1℃，平均溫差容許的誤差為 0.3℃
Q為流量計之流量，其最小刻度 20cc/s
入口高度 29.90mm，游標尺最小刻度 0.05mm
2
加熱片與室溫溫度差最大範圍 35.7－25.8=10.3℃，DA2500E 之準確 度為 0.1℃，平均溫差容許的誤差為 0.3℃
Q為流量計之流量，其最小刻度 20cc/s
B. 熱量散逸之不準度:
(ii) 巴沙木尺寸 62.00mm*12.00mm，游標尺最小刻度 0.05mm
(iii) 溫差最大範圍 45.05－44.20=0.9℃，DA2500E 之準確度為 0.1℃
(ii) 加熱片接觸面積 62.00mm × 2mm，游標尺最小刻度 0.05mm
%
加熱片與室溫溫度差最大範圍 45.05－25.15=19.9℃，DA2500E 之 準確度為 0.1℃，平均溫差容許的誤差為 0.3℃
十二、 雷諾數之不準度分析
由式（3-2），無因次振動振幅Lc lc/W
2
10.3 溫度差Tw之不準度:
加熱片與室溫溫度差最大範圍 35.18－25.15=10.3℃，DA2500E 之準確度為 0.1℃，平均溫差容許的誤差為 0.3℃
附錄二
目前主流的 Sulzer 大型柴油引擎之轉速與輸出功率 REF: http://www.wartsila.com/
本實驗的實際參數
組數 Re W Gr/ReW2 （℃）Tw F c f (1/s) c Case1 300 0.40 10 0.0 0.0 Case2 300 0.81 20 0.0 0.0 Case3 300 1.21 30 0.0 0.0 Case4 300 1.62 40 0.0 0.0 Case5 200 0.91 10 0.0 0.0 Case6 200 1.82 20 0.0 0.0 Case7 200 2.73 30 0.0 0.0 Case8 200 3.64 40 0.0 0.0 Case9 100 4.85 30 0.0 0.0 Case10 300 0.40 10 0.2 1.04 Case11 300 1.62 40 0.2 1.04 Case12 300 0.40 10 0.4 2.08 Case13 300 1.62 40 0.4 2.08 Case14 200 0.91 10 0.2 0.69 Case15 200 3.64 40 0.2 0.69 Case16 200 0.91 10 0.4 1.38 Case17 200 3.64 40 0.4 1.38